Is it possible to be depressed without feeling sad a lot of the time?

I suddenly realised that nothing I do brings me joy any more. Every day I dread the next day, the same old routine. There is not much I can do about it, I suffer from Chron's disease and Chronic Fatigue, so it's not like I can go out and sky dive or something to feel better. I don't sit and cry, just feel the dread of having to do the same things over and over. I realised today that I might be depressed - what do you think?